Off-line operation technology and technology determine the embedding efficiency and stator winding quality. If you accidentally mess up or even tie the wire when you get off the assembly line, the wire will get stuck in the slot and cause rework. Before going offline, first pay attention to whether the coils to be offline are neat and regular, especially whether the effective edges of the wires are arranged neatly and without crossing. Generally, as long as the effective edge of the coil is carefully tied with iron wire before being removed from the mold, it will not come apart. Secondly, pay attention to the direction in which the coil is embedded in the stator, especially for the motor whose junction box is not in the middle, and pay attention to the side where the lead is close to the junction box.